I think at this age, I'd just start with 1.5hr A times, shush/pat for naps and be there ready to resettle if necessary. I'd aim for a 12hr day, she could be a bit OT from the 10hr nights and I think sleeping those long stretches, whilst nice for you, may not last. As I'm sure you know, being consistent is key, so work out what is manageable when the boys are at school and start as you mean to go on.